Conduit, above ground, code question

Running permanent power to the garage: can I run my wire through a conduit above ground? The conduit is already laid, running under our deck and against the side of the house. I ran power through it as a temporary setup, but now I want to do it right and up to code. Part of the pipe also runs under a 4 foot stretch of concrete between the house and the garage, so its only buried 4" at most. The rest of the pipe runs above ground, under the deck.